<template>
  <div class="course">
    <div class="main">
      <!-- 筛选条件 -->
      <div class="condition">
        <ul class="cate-list">
          <li class="title">课程分类:</li>
          <li :class="{this:category===0}" @click="category=0">全部</li>
          <li v-for="(value,index) in category_list" :key="value.id" @click="category=value.id"
              :class="{this:category===value.id}">{{value.name}}
          </li>
        </ul>

        <div class="ordering">
          <ul>
            <li class="title">筛&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;选:</li>
            <li class="default" @click="ChangeOrderType('id')" :class="ChangeOrderClass('id')">默认</li>
            <li class="hot" @click="ChangeOrderType('students')" :class="ChangeOrderClass('students')">人气</li>
            <li class="price" @click="ChangeOrderType('price')" :class="ChangeOrderClass('price')">价格</li>
          </ul>
          <p class="condition-result">共21个课程</p>
        </div>

      </div>
      <!-- 课程列表 -->
      <div class="course-list">
        <div class="course-item" v-for="(value,index) in course_list" :key="value.id">
          <div class="course-image">
            <img :src="value.course_img" alt="">
          </div>
          <div class="course-info">
            <h3>
              <router-link to="/course/detail/1">{{value.name}}</router-link>
              <span><img src="/static/image/avatar1.svg" alt="">{{value.students}}人已加入学习</span></h3>
            <p class="teather-info">{{value.teacher.name}} {{value.teacher.signature}} {{value.teacher.title}} <span>共{{value.lessons}}课时{{value.lessons===value.pub_lessons?`/更新完成`:`/已更新${value.pub_lessons}`}}</span>
            </p>
            <ul class="lesson-list">
              <li v-for="(value,index) in value.lesson_list" :key="value.id"><span class="lesson-title">01 | 第{{value.lesson}}节：{{value.name}}</span>
                <span class="free">免费</span></li>
              <!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>-->
              <!--              <li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>-->
              <!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码初识编码初识编码</span> <span class="free">免费</span></li>-->
            </ul>
            <div class="pay-box">
              <span class="discount-type">限时免费</span>
              <span class="discount-price">￥0.00元</span>
              <span class="original-price">原价：{{value.price}}元</span>
              <span class="buy-now">立即购买</span>
            </div>
          </div>
        </div>

      </div>
    </div>
    <el-pagination
      layout="prev, pager, next, sizes"
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :page-sizes="[2, 3, 5, 10]"
      :page-size="filters.size"
      background
      :total="total"
      >
    </el-pagination>
    <Footer></Footer>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"

  export default {
    name: "Course",
    data() {
      return {
        category: 0,
        category_list: [],
        course_list: [],
        total:0,
        filters: {
          type: 'id',
          order: 'desc',
          page:1,
          size:5,
        },
      }
    },
    components: {
      Header,
      Footer,
    },
    watch:{
      category(){
        this.get_course()
      },
    },
    methods: {
      get_category() {
        this.$axios.get(`${this.$settings.Host}/course/category/`).then(res => {
          this.category_list = res.data;

        }).catch(error => {
          console.log(error)
        })
      },
      get_course() {
        let filter = {
          page:this.filters.page,
          size:this.filters.size
        };
        if (this.category > 0){
          filter.course_category = this.category
        }
        if (this.filters.order === 'desc'){
          filter.ordering = `-${this.filters.type}`
        }else {
          filter.ordering = `${this.filters.type}`
        }
        this.$axios.get(`${this.$settings.Host}/course/list/`,{
          params:filter
        }).then(res => {
          this.course_list = res.data.results;
          this.total = res.data.count
        }).catch(error => {
          console.log(error)
        })
      },
      ChangeOrderType(type) {

        if (this.filters.type !== type) {
          this.filters.type = type;
          this.filters.order = 'desc'
        } else {
          if (this.filters.order === 'asc') {
            this.filters.order = 'desc';
          } else {
            this.filters.order = 'asc';
          }
        }
        this.get_course();
      },
      ChangeOrderClass(type) {
        if (this.filters.type === type && this.filters.order === 'desc') {
          return 'this asc'
        } else if (this.filters.type === type && this.filters.order === 'asc') {
          return 'this desc'
        } else {
          return ''
        }
      },
      handleSizeChange(size){
        this.filters.size = size;
        this.get_course();

      },
      handleCurrentChange(page){
        this.filters.page = page;
        this.get_course();
      }
    },
    created() {
      this.get_category();
      this.get_course()
    }
  }
</script>


<style scoped>
  .course {
    background: #f6f6f6;
  }

  .course .main {
    width: 1100px;
    margin: 35px auto 0;
  }

  .course .condition {
    margin-bottom: 35px;
    padding: 25px 30px 25px 20px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .course .cate-list {
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
    padding-bottom: 18px;
    margin-bottom: 17px;
  }

  .course .cate-list::after {
    content: "";
    display: block;
    clear: both;
  }

  .course .cate-list li {
    float: left;
    font-size: 16px;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
    border: 1px solid transparent; /* transparent 透明 */
  }

  .course .cate-list .title {
    color: #888;
    margin-left: 0;
    letter-spacing: .36px;
    padding: 0;
    line-height: 28px;
  }

  .course .cate-list .this {
    color: #ffc210;
    border: 1px solid #ffc210 !important;
    border-radius: 30px;
  }

  .course .ordering::after {
    content: "";
    display: block;
    clear: both;
  }

  .course .ordering ul {
    float: left;
  }

  .course .ordering ul::after {
    content: "";
    display: block;
    clear: both;
  }

  .course .ordering .condition-result {
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    line-height: 28px;
  }

  .course .ordering ul li {
    float: left;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
  }

  .course .ordering .title {
    font-size: 16px;
    color: #888;
    letter-spacing: .36px;
    margin-left: 0;
    padding: 0;
    line-height: 28px;
  }

  .course .ordering .this {
    color: #ffc210;
  }

  .course .ordering .price {
    position: relative;
  }

  .course .ordering .price::before,
  .course .ordering .price::after {
    cursor: pointer;
    content: "";
    display: block;
    width: 0px;
    height: 0px;
    border: 5px solid transparent;
    position: absolute;
    right: 0;
  }

  .course .ordering .price::before {
    border-bottom: 5px solid #aaa;
    margin-bottom: 2px;
    top: 2px;
  }

  .course .ordering .price::after {
    border-top: 5px solid #aaa;
    bottom: 2px;
  }

  .course .course-item:hover {
    box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);
  }

  .course .course-item {
    width: 1050px;
    background: #fff;
    padding: 20px 30px 20px 20px;
    margin-bottom: 35px;
    border-radius: 2px;
    cursor: pointer;
    box-shadow: 2px 3px 16px rgba(0, 0, 0, .1);
    /* css3.0 过渡动画 hover 事件操作 */
    transition: all .2s ease;
  }

  .course .course-item::after {
    content: "";
    display: block;
    clear: both;
  }

  /* 顶级元素 父级元素  当前元素{} */
  .course .course-item .course-image {
    float: left;
    width: 423px;
    height: 100%;
    margin-right: 30px;
  }

  .course .course-item .course-image img {
    width: 100%;
    object-fit: cover;
  }

  .course .course-item .course-info {
    float: left;
    width: 596px;
  }

  .course-item .course-info h3 {
    font-size: 26px;
    color: #333;
    font-weight: normal;
    margin-bottom: 8px;
  }

  .course-item .course-info h3 span {
    font-size: 14px;
    color: #9b9b9b;
    float: right;
    margin-top: 14px;
  }

  .course-item .course-info h3 span img {
    width: 11px;
    height: auto;
    margin-right: 7px;
  }

  .course-item .course-info .teather-info {
    font-size: 14px;
    color: #9b9b9b;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
  }

  .course-item .course-info .teather-info span {
    float: right;
  }

  .course-item .lesson-list::after {
    content: "";
    display: block;
    clear: both;
  }

  .course-item .lesson-list li {
    float: left;
    width: 44%;
    font-size: 14px;
    color: #666;
    padding-left: 22px;
    /* background: url("路径") 是否平铺 x轴位置 y轴位置 */
    background: url("/static/image/play-icon-gray.svg") no-repeat left 4px;
    margin-bottom: 15px;
  }

  .course-item .lesson-list li .lesson-title {
    /* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    display: inline-block;
    max-width: 200px;
  }

  .course-item .lesson-list li:hover {
    background-image: url("/static/image/play-icon-yellow.svg");
    color: #ffc210;
  }

  .course-item .lesson-list li .free {
    width: 34px;
    height: 20px;
    color: #fd7b4d;
    vertical-align: super;
    margin-left: 10px;
    border: 1px solid #fd7b4d;
    border-radius: 2px;
    text-align: center;
    font-size: 13px;
    white-space: nowrap;
  }

  .course-item .lesson-list li:hover .free {
    color: #ffc210;
    border-color: #ffc210;
  }

  .course-item .pay-box::after {
    content: "";
    display: block;
    clear: both;
  }

  .course-item .pay-box .discount-type {
    padding: 6px 10px;
    font-size: 16px;
    color: #fff;
    text-align: center;
    margin-right: 8px;
    background: #fa6240;
    border: 1px solid #fa6240;
    border-radius: 10px 0 10px 0;
    float: left;
  }

  .course-item .pay-box .discount-price {
    font-size: 24px;
    color: #fa6240;
    float: left;
  }

  .course-item .pay-box .original-price {
    text-decoration: line-through;
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    float: left;
    margin-top: 10px;
  }

  .course-item .pay-box .buy-now {
    width: 120px;
    height: 38px;
    background: transparent;
    color: #fa6240;
    font-size: 16px;
    border: 1px solid #fd7b4d;
    border-radius: 3px;
    transition: all .2s ease-in-out;
    float: right;
    text-align: center;
    line-height: 38px;
  }

  .course-item .pay-box .buy-now:hover {
    color: #fff;
    background: #ffc210;
    border: 1px solid #ffc210;
  }


  .course .ordering .this::before,
  .course .ordering .this::after {
    cursor: pointer;
    content: "";
    display: block;
    width: 0;
    height: 0;
    border: 5px solid transparent;
    position: absolute;
    right: 0;
  }

  .course .ordering .this::before {
    border-bottom: 5px solid #aaa;
    margin-bottom: 2px;
    top: 2px;
  }

  .course .ordering .this::after {
    border-top: 5px solid #aaa;
    bottom: 2px;
  }

  /*// 添加两个新的类 desc asc*/
  .course .ordering .desc::after {
    border-top: 5px solid #f5a623;
  }

  .course .ordering .asc::before {
    border-bottom: 5px solid #f5a623;
  }

</style>
